The ocean is another place where climate change is really really obvious, but also largely unknown by the public.
The ocean functions as a huge reservoir for absorbing & trapping CO2. But absorption of CO2 turns into carbonic acid, and humans are producing so much CO2 that we are measurably changing the pH of the ocean: http://en.wikipedia.org/wiki/Ocean_acidification
The ocean functions as a huge reservoir for absorbing & trapping CO2. But absorption of CO2 turns into carbonic acid, and humans are producing so much CO2 that we are measurably changing the pH of the ocean: http://en.wikipedia.org/wiki/Ocean_acidification